'Release the object variables from memory 'In the item has not been added then add it now so subsequent matches will be deleted 'If the item has previously been added then delete this duplicate Message = Folder.Items(i).Subject & '|' & Folder.Items(i).Body 'This is setup to use the Sunject and Body, additional criteria could be added if desired

'Load the matching criteria to a variable 'Loop backwards to ensure that the deleting of the emails does not interfere with subsequent items in the loop 'Check each email starting from the last and working backwards to 1 'Get the count of the number of emails in the folder 'Allow the user to select a folder in Outlook Set AppOL = CreateObject('Outlook.Application')

Set Items = CreateObject('Scripting.Dictionary') Accoridng to my tests, it could remove the duplicate items that I copy and paste manually in a specific folder, so please try to press ' Alt + F11' to paste the script and run it in the user's Outlook to check if it could also work for you (Notice: we may need to Enable all macro in Outlook to run the script- File>Option>Trust center>Trust center settings>Macro settings>Enable all macro) : Sub DeleteDuplicateEmailsInSelectedFolder() And agree with michev, we could first try to log into your web mail to check if there are any duplicate items there.Р вЂќР вЂћlso, for your requirement of removing duplicate in Outlook, I found a relevant VBA script below. pst file to your mailbox before? As I know, it may cause some duplicate emails if we import a file and forget to choose 'don't import duplicate'. This makes sure that you have a complete record of all content in the Conversation in the event someone alters a message that is contained inside a reply.Hi the user import any. We recommend that you select this option. To always keep the original message if someone alters the message when it is included in replies, select the When a reply modifies a message, donР Р†Р вЂљРІвЂћСћt move the original check box. To always keep any message that is digitally signed, select the DonР Р†Р вЂљРІвЂћСћt move digitally-signed messages check box. Flags apply to specific messages, and deleting a flagged message would result in the loss of the flagged message. To always keep any message that is flagged, select the DonР Р†Р вЂљРІвЂћСћt move flagged messages check box. Categories apply to specific messages, and deleting a categorized message would result in the loss of the categorized message. To always keep any message that is categorized, select the DonР Р†Р вЂљРІвЂћСћt move categorized messages check box. The remaining Conversation messages will contain any messages that are deleted, such as those that you might not have read.

We recommend that you donР Р†Р вЂљРІвЂћСћt select this option. To always keep any message that you havenР Р†Р вЂљРІвЂћСћt read, select the DonР Р†Р вЂљРІвЂћСћt move unread messages check box. Note: This option is not available if the destination is the Deleted Items folder. On the Home tab, in the Delete group, click Clean Up.Р вЂќР’В¬lean Up Conversation The current Conversation is reviewed, and redundant messages are deleted.Р вЂќР’В¬lean Up Folder All Conversations in the selected folder are reviewed, and redundant messages are deleted.Р вЂќР’В¬lean Up Folder & Subfolders All Conversations in the selected folder and any folder that it contains are reviewed, and redundant messages are deleted. Conversation Clean Up can delete all of the messages except the last one from Tim because within that message is a copy of all of the previous messages.Р вЂќР’В¬onversation Clean Up is most useful on Conversations with many responses back and forth, especially with many recipients. TimР Р†Р вЂљРІвЂћСћs reply includes all of the previous messages in the Conversation. Now, Tim sees AnneР Р†Р вЂљРІвЂћСћs message and replies to both Jeff and Anne. Anne replies to both Jeff and Tim and in her Outlook message body, JeffР Р†Р вЂљРІвЂћСћs complete original message is included. If a message is completely contained within one of the replies, the previous message is deleted. What does Conversation Clean Up do?Р вЂќР’В¬onversation Clean Up evaluates the contents of each message in the Conversation. Multiple people might reply to different messages in the Conversation. In many Conversations, there might be many replies back and forth. The messages of a Conversation have the same subject.Р вЂќР вЂЎor example, when you send a message to someone and then they reply, a Conversation results. A Conversation is the complete set of email messages from the first message through all responses. You might know a Conversation by the term email thread. Redundant messages throughout a Conversation are moved to the Deleted Items folder.

The Conversation Clean Up feature in Outlook can reduce the number of messages in your mail folders.

Delete duplicate emails in outlook 2016